/**
 * Copyright (c) 2011-2014, hubin (243194995@qq.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package wang.leq.sso.waf.request;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import wang.leq.sso.waf.WafHelper;

/**
 * Request请求过滤包装
 * <p>
 * @author   hubin
 * @Date	 2014-5-8 	 
 */
public class WafRequestWrapper extends HttpServletRequestWrapper {

	private boolean filterXSS = true;

	private boolean filterSQL = true;


	public WafRequestWrapper( HttpServletRequest request, boolean filterXSS, boolean filterSQL ) {
		super(request);
		this.filterXSS = filterXSS;
		this.filterSQL = filterSQL;
	}


	public WafRequestWrapper( HttpServletRequest request ) {
		this(request, true, true);
	}


	/**
	 * @Description 数组参数过滤
	 * @param parameter
	 * 				过滤参数
	 * @return
	 */
	@Override
	public String[] getParameterValues( String parameter ) {
		String[] values = super.getParameterValues(parameter);
		if ( values == null ) {
			return null;
		}

		int count = values.length;
		String[] encodedValues = new String[count];
		for ( int i = 0 ; i < count ; i++ ) {
			encodedValues[i] = filterParamString(values[i]);
		}

		return encodedValues;
	}


	/**
	 * @Description 参数过滤
	 * @param parameter
	 * 				过滤参数
	 * @return
	 */
	@Override
	public String getParameter( String parameter ) {
		return filterParamString(super.getParameter(parameter));
	}


	/**
	 * @Description 请求头过滤 
	 * @param name
	 * 				过滤内容
	 * @return
	 */
	@Override
	public String getHeader( String name ) {
		return filterParamString(super.getHeader(name));
	}


	/**
	 * @Description Cookie内容过滤
	 * @return
	 */
	@Override
	public Cookie[] getCookies() {
		Cookie[] existingCookies = super.getCookies();
		if ( existingCookies != null ) {
			for ( int i = 0 ; i < existingCookies.length ; ++i ) {
				Cookie cookie = existingCookies[i];
				cookie.setValue(filterParamString(cookie.getValue()));
			}
		}
		return existingCookies;
	}


	/**
	 * @Description 过滤字符串内容
	 * @param rawValue
	 * 				待处理内容
	 * @return
	 */
	protected String filterParamString( String rawValue ) {
		if ( rawValue == null ) {
			return null;
		}
		String tmpStr = rawValue;
		if ( this.filterXSS ) {
			tmpStr = WafHelper.stripXSS(rawValue);
		}
		if ( this.filterSQL ) {
			tmpStr = WafHelper.stripSqlInjection(tmpStr);
		}
		return tmpStr;
	}
}
